Varun Singh Pratap

About Varun Singh Pratap

Senior Developer and Systems Architect specializing in SIP, VoIP, WebRTC, Agentic Voice AI, and real-time Audio/Video media processing, with a strong focus on security-first communication platforms. Extensive experience designing, building, and operating carrier-grade, low-latency VoIP infrastructures and AI-enhanced voice systems at global scale.Deep expertise in open-source communication stacks including FreeSWITCH, OpenSIPS, Kamailio, RTPengine, Linphone, Pipecat, PJSIP, and Asterisk, along with knowledge of audio/video codecs, secure programming practices, Kubernetes, and cloud-native architecture. Proven ability to deliver highly available systems with near-zero downtime in mission-critical environments.Core Expertise:VoIP & Real-Time Communication: SIP, VoIP, WebRTC, RTP, NAT traversal, media relaysOpen-Source Platforms: FreeSWITCH, OpenSIPS, Kamailio, RTPengine, Linphone, Pipecat, PJSIP, AsteriskVoice AI & Media Processing: Agentic Voice AI, STT/LLM/TTS orchestration, audio/video codecsArchitecture & Reliability: High availability, near-zero downtime systems, global deploymentsSecurity: Secure programming, VoIP security, media path protectionCloud & Infrastructure: Kubernetes, cloud-native design, scalable distributed systems#Freeswitch, Opensips, Kamailio, WebRTCProgramming Languages: C++, C, Java, Python, Go, Nodejs, JavaScript.

Experience

1. Senior Software Engineer

   Vonage

   May 2022 — Present

   At Vonage, I have contributed for over three years to the core SIP and media infrastructure, helping power a globally distributed platform that reliably supports 25+ million daily sessions. My work focuses on system architecture, stability engineering, fault tolerance, and graceful rollout of new features, ensuring consistent quality of service across regions. These efforts directly support Vonage’s position as a leader in enterprise-grade VoIP and real-time communications.I actively contribute to the Pipecat Voice AI orchestration platform and pipecat-examples, extending traditional VoIP stacks into AI-driven, agentic voice workflows. This includes integrating STT/LLM/TTS pipelines with real-time media transports, enabling scalable conversational AI over telephony and WebRTC.

Education

• Krishna Institute of Engineering & Technology

  Bachelor of Technology - BTech, Computer Science

• Indian Institute of Technology, Kanpur

  Master's degree, Computer Science

Skills

• C++
• Integration
• Gsm
• Unix
• Voip
• Sip
• Networking
• Linux
• C
• Programming
• Ip
• Telecommunications